control valve resonse time measurement

[Dost]

I am a new student in control valves.I am using control valve to control the liquid level by controlling the flow using control valve.I Want to know the response time and time constant of the control valve , I do nt have any idea how to do it,any bodyhave any info about it or any link where i can get some relevant informatiom.

Regards

Dost

[bul]

You will need to do some transient measurements. You can suddenly open your valve and measure the flow rate increase in time and can derive the time constant by doing measurements with different inlet pressures and valve settings. But normally valve producers are providing this information. May be you should first look at the documents of the valve.